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MHD will replace your dinan tune completely. Ask the MHD guys if you can write directly over it or if a stock flash is needed first. MHD can also flash a stock binary, but maybe not to a car without MHD or stock software.
JB4 is best to throw in the trash or put on classifieds. It hijacks like 4 sensors and spams the canbus vs a good flash tune having over 100 complicated maps modified from stock, letting the engine make power more smoothly, consistently under a variety of conditions AND most important with the stock safeties working as well as they can!
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